You could use the DataObject class to pass the desired data and replace the DragDropPayloadManager. For example check the implementation below:
sender, DragInitializeEventArgs args)
DataObject dragData =
args.Data = dragData;
However, we suggest you to consider upgrading your application to a higher version in order to get advantage of all new features and controls provided by the suite including the DragDropPayloadManaged. You could also check the following article that provides detailed information how to migrate to the DragDropManager:
Hope this helps.
Telerik by Progress
Do you need help with upgrading your AJAX, WPF or WinForms project? Check the Telerik API Analyzer
and share your thoughts.